渤海超高温碳酸盐岩储层酸化技术

Acidizing Technique for Carbonate Reservoirs with Super-high Temperature in Bohai Sea

潜山碳酸盐岩储层是当前渤海油气勘探开发的重点领域,而酸化则是碳酸盐岩油气藏增产改造的关键措施。在研究渤海潜山超高温碳酸盐岩油气藏勘探开发的过程中,针对其超高温、埋藏深、物性差、非均质性强、测试层段长、含硫化氢等特点,通过相应的基础理论研究和技术研发配套,创新性地提出“非酸螯合+高温缓速缓蚀”相结合的方式。通过非酸螯合体系降温缓速、深部溶蚀,结合高温缓速缓蚀酸液激活天然裂缝、增大改造范围,形成了针对渤海潜山超高温碳酸盐岩储层的酸化技术。该技术在现场成功应用,探井A酸化后测试产气量增加55倍,增产效果显著。

Buried hill carbonate reservoirs are the key areas of oil and gas exploration and development in Bohai Sea,while acidification is essential for exploration and development of carbonate reservoirs.In the process of studying the exploration and development of Buried hill carbonate reservoirs with super-high temperature in Bohai Sea,a new acidizing technique“non-acid chelating+high temperature retarded acid”was developed for super-high temperature carbonate reservoirs based on the characteristics of super-high temperature,deep burial,poor physical property,strong heterogeneous,long testing layer and containing hydrogen sulfide with combination of the corresponding fundamental research and technological supporting research.The non-acid chelating system can reduce the formation temperature and reaction rate,achieve the deep penetration.The high temperature retarded acid can activate the natural fracture and distribute the acid uniformly.Then the acidizing technique for carbonate reservoirs with super-high temperature in Bohai Sea has been formed.This technique has been successfully applied in Well A.The stimulation effect was remarkable,and the test production rate of gas increased by 55 times.